• Title/Summary/Keyword: steel deckplate

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Stress Concentration of Longitudinal Rib to Deckplate Welded Joint in Orthotropic Steel Bridge Decks (강상판 종리브.바닥강판 응접연결부의 응력집중)

  • 장동일;최동호;최준혁;김도환
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.04a
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    • pp.343-350
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    • 1999
  • Orthotropic steel bridge decks are potentially liable to cause fatigue cracks due to weld defects, residual stresses, and in-plane or out-of-plane stresses. In particular, the cracks propagated through deckplate in longitudinal rib to deckplate joints occur at weld toe and weld root due to stress concentrations. Numerical parametric studies are performed to show the Influence of the parameters on the stress concentration at the connection between the longitudinal rib and the deckplate. The parameters include root gap, toe angle $\theta$, toe radius $\rho$, and weld penetration. This study provides a fundamental point for the improvement of fatigue resistance and the estimation of the fatigue crack propagation in wekded joint details.

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An Analytical Study on the Structural Behavior of the Composite Slab with New-Shaped Deckplate (신형상의 합성용 데크플레이트를 사용한 합성슬래브의 구조적 거동에 관한 해석적 연구)

  • Moon, Tae Sup;Bae, Jong Woo
    • Journal of Korean Society of Steel Construction
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    • v.11 no.2 s.39
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    • pp.181-190
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    • 1999
  • The objective of this study is to investigate the structural behavior of the composite slabs with the new-shaped deckplate. In order to examine the deckplate as structural members, the composite slabs with new-shaped deckplate are compared and verified with the international design codes, and the simple inertia-moment equation of the composite slabs is suggested from the regression analysis of the results of the experiments. Besides, the finite element analysis was added on the purpose of the observation of structural behavior of the section items such as the Locking rib and the Dovetail. 36 experiments of composite slabs were performed with two new-type deckplates. And the finite-element analysis was performed by ABAQUS package with the function of the 3-dimension solid modeling.

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A Shear Bond Chracteristics of Composite Slab with Closed-Shape Deckplate (폐쇄형 데크플레이트를 사용한 합성슬래브의 전단부착 특성에 관한 연구)

  • Ju, Gi Su;Park, Sung Moo
    • Journal of Korean Society of Steel Construction
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    • v.13 no.5
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    • pp.557-566
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    • 2001
  • Composite slab with deckplate needs sufficient bond strength between deckplate and concrete to conduct composite behavior Composite slab can transfer the shear by either chemical adhesion interface interlock, or active friction. There are several way of mechanical shear connection in composite slab. that is embossments shear connector shape of deckplate etc. Effect of mechanical interaction is deped on shape of deckplate which is to prevent peeling between deckplate and concrete and an amount of shear connector. The behavior and strength of the connection between the decking and the concrete slab due to embossments and end anchorage may be estimated using the push-off tests described in this paper We proposed the equation of shear bond strength in the composite slab It will be use to design by basic data in composite slab.

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Study on the Composite Capacity of Composite Slabs by Deckplate Section Shapes (데크플레이트 단면형상에 따른 합성슬래브의 합성능력에 관한 연구)

  • Ju, Gi-Su;Park, Sung-Moo
    • Journal of Korean Society of Steel Construction
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    • v.12 no.6
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    • pp.671-680
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    • 2000
  • This paper provides the results of the study on the structural behavior of the composite metal deck slab system. The experimental study on composite slabs with trapezoidal and inverse-triangle-top-flange deckplate result, it was found that the geometry of the cross-section was more important than any other factors to ensure the composite action of deck slabs. Hence the inverse-triangle-top-flange of closed box was more effective on the shear slip and deflection than the trapezoidal deck of open shape. These results show that the continuing development of composite deck plate must consider importantly the geometry of the deck. The experimental results were compared with established formulas and were analysed to advance a theory on composite slabs using deckplates.

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A Study on the Structural Behavior of the Composite Slab with New-Shaped Deckplate (신형상 데크플레이트를 이용한 합성슬라브의 구조적인 거동에 대한 연구)

  • Huh, Choong;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.9 no.3 s.32
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    • pp.341-350
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    • 1997
  • The objective of this study is to investigate the structural behavior of the composite slabs with the new metal deckplate. The new deckplate can be used as structural member with topping concrete. So several experiments of this structural test and the fire resistance test were done. From this experiments. slabs with new metal deckpklate were verified as composite slabs. In this paper, this verifications were compared with the international design methods. For experiment. 49 specimens were made. the main parameters are deckplate thickness (1.2mm. 1.6mm) depth of topping concrete(85mm. 90mm). support condition(simple, 2-span), shear reinforcment(studs), span(2.7m, 3.0m, 3.3m. 3.6m. 3.9m) and shear span(L/3, L/4, L/7). We analyzed the structural behavior of composite slab throughout the moment-curvature relationship which is obtained with the program using the computer language. Turbo C. From this development for slab system, the reinforced concrete or steel structure building may be easy, economical for construction, And informations about the structural behavior of composite slabs will be utilized to established korea standard.

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A Proposal for Strength Formula of Web Crippling in Trapezoidal Sheeting (데크플레이트의 웨브국부좌굴에 관한 내력식 제안)

  • Shin, Tae Song
    • Journal of Korean Society of Steel Construction
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    • v.13 no.6
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    • pp.641-649
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    • 2001
  • It is proposed in this paper the practical load carrying capacity formula for web crippling in trapezoidal sheeting (deckplate). The parameter functions are derived by investigation of the major parameters influencing of load carrying capacity based on the existing theoretical research with experiment analogical interpretation model. The simple strength formula is proposed in analytic comparison of each parameters with the existing experimental data. From statistical evaluations due to Annex Z of Eurocode 3 the partial safety resistance factors ${\gamma}_M$ are calculated and compared with the target value of 1.1.

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Structural Performance of a New Truss Deckplate System with UHPC Infilled Top Chords in Construction Stage (UHPC 충전형 상현재를 활용한 트러스 데크플레이트 시스템 시공단계 구조성능 평가)

  • Son, Hong-Jun;Kim, Young-Ho;Kim, Dae-Jin
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.33 no.2
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    • pp.137-144
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    • 2020
  • In this study, we propose a new truss deckplate system, which does not require temporary floor supports during construction, with ultra-high-performance concrete (UHPC) infilled top bars. The increased stiffness and strength of the proposed system were well retained as compared to those of the existing truss deckplate systems, thereby resulting in the reduction of maximum deflection at the span center. Four-point bending tests were performed on five specimens with a net span of 4.6 m to evaluate the structural performance of proposed system in the construction stage. In addition, the load-deflection curve was plotted for each specimen, and the effects of test parameters were analyzed. Further, a rigorous nonlinear three-dimensional finite element analysis was performed, and its results were compared with the test results. From the results, it was observed that the test specimens of the proposed system exhibited superior performance as compared to those of the existing one and also satisfied the serviceability requirement during construction provided by the Korea Building Code 2016.

Study on Section Properties of Deckplates with Flat-Hat Stiffners (Flat-Hat 스티프너를 가진 데크플레이트의 단면 성능에 관한 연구)

  • Ju, Gi-Su;Park, Sung-Moo
    • Journal of Korean Association for Spatial Structures
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    • v.4 no.1 s.11
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    • pp.77-86
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    • 2004
  • It is the buckling of the compression portions of the deckplate that govern its behaviour under wet concrete construction loading. The size and position of intermediate stiffeners in the compression flanges of thin-plate steel decks exert a strong influence on the dominant buckling mode of the flange. Test sections composed of high-strength steel were brake pressed with a variety of Flat-hat intermediate stiffeners in the compression flange forming a progression from small to large stiffeners. The ABAQUS program to determine the effectiveness of intermediate stiffeners in controlling buckling modes is undertaken. A series of specimens are loaded with simple beam. Various buckling wave forms prior to ultimate failure through a plastic collapse mechanism. The experimentally determined buckling stresses are found to be comparable with studies performed using the ABAQUS program analysis and using each country code.

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Evaluation of Fatigue Strength in Scallop at Field Bolted Joints of Longitudinal Rib and Deck Plate in Orthotropic Steel Decks (강바닥판 데크플레이트와 종리브 현장연결 스캘럽부의 피로강도 평가)

  • Choi, Dong Ho;Choi, Hang Yong
    • Journal of Korean Society of Steel Construction
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    • v.14 no.6
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    • pp.683-690
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    • 2002
  • Static and fatigue tests were performed to evaluate fatigue strength in scallop at field bolted joints of longitudinal rib and deck plate in orthotropic steel decks. Numerical parametric studies using finite elemtn analysis were also conducted to show the influence of parameters such as length and radius of scallop, and thickness of deckplate on the stress concentration at the scallop. In the low stress level, fatigue tests yielded cracks at the scallop while in the high stress level, catastrophic failure of longitudinal rib occurred following the failure of handhole cover plate. Fatigue strength was compared with JSSC specification and the predicted S-N curves using Shigley and Juvinall methods, and a satisfactory result was obtatined.

Bending Behaviour of Composite Slab Using a New-Shaped Steel Deck Plate and Expanded Metal (신형 데크플레이트와 철판망을 적용한 합성슬래브의 휨 거동)

  • Kim, Myoung Mo;Eom, Chul Hwan
    • Journal of Korean Society of Steel Construction
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    • v.15 no.4 s.65
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    • pp.403-412
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    • 2003
  • The composite metal deck plate system has been widely used for office structures. Recently, however, the flat deck plate has been developed to apply the composite slab system to residential structures. Reduction in construction cost and time can be expected by using expanded metal instead of wire mesh as crack control reinforcements. This study proposed a composite slab system composed of a new-shaped steel deck plate and expanded metal. Twelve specimens were tested to evaluate the structural performance of the new composite slab system. The test results were summarized mainly in terms of maximum load carrying capacity and failure behaviors of each specimen.